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Upper Respiratory Tract
Infections
Department of Clinical Microbiology
http://www.tcd.ie/Clinical_Microbiology
OBJECTIVES
• Understanding of
• Presentation of Upper Respiratory
Infections
• Causative organisms
• Pathogenesis
• Diagnosis(clinical, laboratory, other)
• Clinical Management( treatment,
preventative measures)
Infection Syndromes
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•
•
•
•
•
Common Cold
Pharyngitis/Tonsillitis
Quinsy
Epiglottis
Otitis Media
Sinusitis
Sinusitis
Pharyngitis,Epiglottis
Anatomy
Otitis Media
Common Cold
• Causative agents: Coronaviruses etc
• Epidemiology: usually common in the winter
months
• Presentation: rhinitis, headache, conjunctival
suffusion
• Management: Antimicrobial agents not to be
given.Symptomatic relief may be accompanied by
mucopurluent rhinitis( thick,opaque or discolored
nasal discharge), this is not an indication for
antimicrobial treatment unless it persists without
signs of improvement 10-14 days suggesting
possible sinusitis.
Pharyngitis
• Definition: Inflamminatory Syndrome of the
pharynx caused by several microorganisms
• Causes: most viral but may also occur as
part of common cold or influenza syndrome
• The most bacterial cause is Group A
Streptococcus (Streptococcus pyogenes)-520%
• Review: NEJM 344:205 2001
Pharyngitis Presentation
ETIOLOGY
Microbial Causes of Acute Pharyngitis
Pathogen
Viral
Rhinovirus (100 types and 1 subtype)
Coronavirus (3 or more types)
Adenovirus (types 3, 4, 7, 14, 21)
Herpes simplex virus (types 1 and 2)
Parainfluenza virus (types 1-4)
Influenza virus (types A and B)
Cocksackievirus A (types 2, 4-6, 8,
10)
Epstein-Barr virus
Cytomegalovirus
HIV-1
Bacterial
Streptococcus pyogenes (group A
b-hemolytic streptococci)
Group C b-hemolytic streptococci
Mixed anaerobic infection
Neisseria gonorrhoeae
Corynebacterium diphtheriae
Corynebacterium ulcerans
Arcanobacterium haemolyticum
(Corynebacterium haemolyticum)
Yersinia enterocolitica
Treponema pallidum
Chlamydial
Chlamydia pneumoniae
Mycoplasmal
Mycoplasma pneumoniae
Mycoplasma hominis (type 1)
Unknown
Syndrome/Disease
Common cold
Common cold
Phayrngoconjunctival fever, ARD
Gingivitis, stomatitis, Pharyngitis
Common cold, croup
Influenza
Herpangina
Infectious mononucleosis
Infectious mononucleosis
Primary HIV infection
Pharyngitis/tonsillitis, scarlet fever
Gingivitis, Pharyngitis
(Vincent’s angina)
Peritonsillitis/peritonsillar abscess
(quinsy)
Pharyngitis
Diphtheria
Pharyngitis, diphtheria
Pharyngitis, scarlatiniform rash
Pharyngitis, enterocolitis
Secondary syphilis
Estimated
Importance
20
5
5
4
2
2
<1
<1
<1
<1
15-30
5-10
<1
<1
<1
1
<1
<1
<1
<1
Unknown
<1
Unknown
Pneumonia/bronchitis/Pharyngitis
Pneumonia/bronchitis/Pharyngitis
Pharyngitis in volunteers
Approximately 15% of all cases of Pharyngitis are due to S. pyogenes. Strep. of Group C and B have also been implicated in some cases.
Pharyngitis Clinical Presentation
• Clinical presentation
with soreness of the
throat, may be
dysphagia and pain on
swallowing, fever and
additional upper
respiratory symptoms
may also be present,
Tender cervical
lymphadenopathy
Pharyngitis-Clinical Presentation
• Exudative or Diffuse erythema-Group A , C, G
Streptococcus , EBV, Neisseriae gonococcus
C.diphtheriae, A.haemolyticum, Mycoplasma
pneumoniae
• Vesicular, ulcerative- Coxsackie A9, B 1-5,
,ECHO, Enterovirus 71, Herpes simplex 1 and 2
• Membranous- Corynebacterium diphtheriae or
Vincent Angina ( anaerobes/spirochetes)
Pharyngitis Diagnosis
• Clinical Presentation
• Determine if Group A
Streptococcus is present
by throat swab onto blood
agar
• Antigen Kit may also be
used
• Important to determine if
present as treatment
reduces risk of acute
rheumatic fever and will
reduce duration of
symptoms
Pharnygitis Diagnosis
• B-Haemolytic colonies
of Group A
Streptococcus from a
throat swab
Quinsy Clinical Presentation
• Tonsillar Abscess with
pain,fever, difficulty
swallowing
Quinsy Diagnosis
• Tonsillar Abscess
examination
Quinsy Clinical Management
• Drainage of Abscess
and antimicrobial
therapy
Epiglottis
• Definition:Inflammination of the epiglottis
due to infection
• Epidemiology:usually occurs in the winter
months
• Causative Organisms:H.Influenzae( now
rare), S.pyogenes, Pneumococcus,
Staphylococcus aureus
Epiglottis Clinical Presentation
• In children because of
the small airway may
obstruct breathing and
symptoms of adults
• In adults fever, pain on
swallowing, sore
throat, cough
sometimes with
purulent secretions
Epiglottis Diagnosis
• Clinical presentation
• Lateral X-ray
• Blood
Cultures/Respiratory
Secretions for Culture
Epiglottis Clinical Management
• Maintain airway in
children may require
tracheostomy
• ( trachestomy set
should be at bedside)
• Cefotaxime I/V
Haemophilus Influenzae Culture
OTITIS MEDIA
American Academy of Pediatrics
and American Academy of
Family Physicians
Clinical Practice Guidelines
Pediatrics Vol. 113 No.5 May
2004
Otitis Media
• Definition: for diagnosis requires 3 things
• Confirmation of acute onset
• Signs of Middle Ear Effusion (Pneumatic
otoscopy)-Bulging of TM, Limited mobility, Airfluid level, otorrhoea
• Evaluation of Signs and Symptoms of Middle Ear
Inflammination: Erythema of TM or Distinct
otalgia ( interfers with sleep)
• Epidemiology : AOM must common cause of
antibiotic prescribing in paediatric population, cost
$1.96 billion in U.S, more common in some
conditions such as cleft palate, Down's syndrome,
genetic influences, occurs in the winter months but
may be recurrent
Otitis Media
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•
•
•
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Causative Organisms:
Streptococcus pneumoniae-25-50%
Haemphilus Influenzae-15-30%
Moraxella catarrhalis-3-30%
Rhinovirus/RSV/Coronaviruses/Adenoviruse
s/Enteroviruses –40-75%
Streptococcus pneumoniae
Otitis Media Clinical
Presentation
• Symptoms: Infant
excessive crying, pulling
ear
• Toddler: irritability ,
earache
• Both may have otorrhoea
• Signs: Fever , bulging
eardrum, fullness and
erythema of tympanic
membrane
• May also be additional
upper respiratory
symptoms
Otitis Media Diagnosis
• Diagnosis of MEE can
be made a number of
ways
• MEE is not AOM
• MEE may occur
before AOM, without
AOM or post AOM
Recommendation 2
• The management of AOM should include
an assessment of Pain
• ( and treat accordingly|)
Recommendation 3a
• Observation without use of antimicrobial
agents in a child with uncomplicated AOM
is an option for selected children based on
diagnostic certainty, age, illness severity
and assurance of follow-up
Otitis Media Clinical
Management
• Analgesia
• Observation if
appropriate
• If a decision is made
to treat with an
antibacterial agent
amoxicillin should be
prescribed for most
children at a dose of
80-90 mg/kg/day.
Recommendation 4
• If there is no clinical improvement in 48-72
hours
• Reassess and confirm or exclude diagnosis
of AOM
• If Observation arm: treat
• If Treatment arm: Change therapy
• Duration of therapy: 10 days if 2 or less or
severe 10 days , if > 2 years 5-7 days
Recommendation
• Physicians should encourage prevention
• -How?
Recurrent Otitis Media
Sinusitis
• Definition:Acute Bacterial Sinusitis,
subacute Bacterial Sinusitis, Recurrent
acute, Chronic sinusitis , Superimposed
• Epidemiology:children has 6-8 viral UTI
per year and 5-13% may be complicated by
sinusitis
Definitions Sinusitis
• Acute Bacterial : Bacterial Infection of the paranasal
sinuses lasting less than 30days in which symptoms
resolve completely
• Subacaute Bacterial Sinusitis: Lasting between 30 and 90
days in which synptoms resolve completely
• Recurrent acute bacterial sinusitis: Each episode lasting
less than 30 days and separated by intervals of at least
10days during which the patient is asymptomatic
• Chronic Sinusitis: Episode lasting longer than 90 days
.Patients have persistent residual respiratory stmptomssuch
as cough, rhinnorrhoea or nasal obstruction
• Chronic Sinusitis: New symptoms resolve but underlying
residue symptoms do not.
Sinusitis
• Pathogens:
• Streptococcus
pneumoniae-30%
• Haemphilus
Influenzae-20%
• Moraxella catarrhalis20%
Sinusitis
• Diagnosis: > or = 10,000 cfu/ml from the
cavity of paranasal sinus- but this is
invasive
Recommendation 1
• Diagnosis is based on clinical criteria who have
upper RT symptoms that are persistent or severe
• Acute bacterial
• Persistent symptoms: nasal or postnasal D/C ,
daytime cough(worse at night) or both
• Severe Symptoms: Temp(>39 C) and purulent
nasal D/C present concurrently for at least 3-4
days in a child who seems ill
Recommendation 2a
• Imaging studies are not necessary to
confirm a diagnosis of clinical sinusitis in
children less than 6 year of age
X-ray of Sinuses
Recommendation 2b
• Ct scans should be preserved for those who
may require surgery as part of management
Recommendation
• Antibiotics are recommended for Acute
Bacterial Sinusitis to achieve a more rapid
clinical cure
• Amoxicillin at 45 or 90 mg/kg.day
recommended
– Most response in 48-72 hours
– Duration :until symptom free plus 7 days
Recommendation
• Children with complications or suspected
should be treated promptly and aggressively
• Referral to ENT specialist,
Ophthalmologist, ID physicians and
neurosurgeon
• Complications involve orbit and Central
Nervous System